AutoSSL (Let's Encrypt) with Confluence over HTTPS

I currently have an instance of Confluence Server running on my VPS and I'm trying to get it running over HTTPS, but I'm having a few issues.

Is it possible to use Lets Encrypt with Confluence Server?

The SSL's are not password protected, and I don't think they store .keystore files, or at least none that I can find on my server.

I can access cPanel and WHM over HTTPS on the same domain so I know the domain has an SSL issued, I just can't get it working with Confluence. I've changed the server.xml file and changed the base URL, but https and port 8443 just brings up a "cannot connect" error in the browser. I could be doing something completely wrong though.